Low Voltage Detection Circuit

1. A low voltage detection circuit comprising: a first transistor that is configured to generate a first constant current; a load element that generates a reference voltage corresponding to the first constant current; a second transistor that is configured to generate a second constant current that is proportional to the first constant current; a divider circuit that is connected in series with the second transistor and divides a power supply voltage; a third transistor that is controlled by a voltage at a connecting node between the second transistor and the divider circuit and provides the load element with an auxiliary current; and a comparator that compares the reference voltage with a divided power supply voltage obtained by dividing the power supply voltage by the divider circuit.

2. The low voltage detection circuit of claim 1 , wherein the first transistor and the second transistor constitute a current mirror.

3. The low voltage detection circuit of claim 1 , wherein the second constant current is larger than the first constant current.

4. The low voltage detection circuit of claim 2 , wherein the second constant current is larger than the first constant current.

5. The low voltage detection circuit of claim 1 , wherein the load element comprises a resistor and a diode.

6. The low voltage detection circuit of claim 1 , wherein the second and third transistors are comprised by MOS transistors and, wherein the connecting node between the second transistor and the divider circuit is connected with a gate of the third transistor.

7. The low voltage detection circuit of claim 1 , further comprising a resistor that limits the auxiliary current.

8. The low voltage detection circuit of claim 1 , wherein the third transistor comprises a P-channel type MOS transistor.